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Device and method of monitoring a position and predicting an exit of a subject on or from a substrate

  • US 9,445,751 B2
  • Filed: 07/18/2013
  • Issued: 09/20/2016
  • Est. Priority Date: 07/18/2013
  • Status: Active Grant
First Claim
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1. A method for monitoring a subject, comprising:

  • sensing incident pressure waves generated by the subject moving on a divided bladder having a width and a length, the divided bladder comprising a first interleaved portion and a second interleaved portion, wherein the first interleaved portion has a first set of fingers and the second interleaved portion has a second set of fingers, wherein the first set of fingers is interleaved with the second set of fingers, wherein each of the first and second interleaved portions extends nearly the entire width of the divided bladder so as to define a horizontal axis extending laterally along the first and second interleaved portions with at least one first sensor in fluid communication with the first interleaved portion of the bladder and at least one second sensor in fluid communication with the second interleaved portion of the divided bladder, such that the at least one first sensor detects degree of pressure exerted on the first interleaved portion by the subject and the at least one second sensor detects degree of pressure exerted on the second interleaved portion by the subject;

    generating signals substantially concurrently from each of the first and second interleaved portions indicative of the incident pressure waves for each of the first and second interleaved portions of the bladder and sending the signals to a processor;

    determining a horizontal position of the subject along the horizontal axis of the interleaved portions of the divided bladder as a function of a difference between the signals from each of the first and second interleaved portions; and

    generating a horizontal position pattern for the subject over a period of time wherein the horizontal position pattern includes a plurality of positions along the horizontal axis and a trajectory of movement between the plurality of horizontal positions over the period of time.

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